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LM5145 Datasheet(PDF) 1 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 69 page  LM25143 3.5-V to 42-V Dual Synchronous Buck DC/DC Controller With Ultra-Low IQ 1 Features • Functional Safety-Capable – Documentation available to aid functional safety system design • Versatile synchronous buck DC/DC controller – Wide input voltage range of 3.5 V to 42 V – 1% accurate, fixed 3.3-V, 5-V, or adjustable outputs from 0.6 V to 36 V – 150°C maximum junction temperature – 4-µA typical shutdown mode current – 15-µA typical no-load standby current • Two interleaved synchronous buck channels – Dual channel or single-output multiphase – 65-ns tON(min) for high VIN/VOUT ratio – 60-ns tOFF(min) for low dropout • Inherent protection features for robust design – Shunt or inductor DCR current sensing – Hiccup mode overcurrent protection – Independent ENABLE and PGOOD functions – Adjustable output voltage soft start – VCC, VDDA, and gate-drive UVLO protection – Thermal shutdown protection with hysteresis • Optimized for CISPR 11 and CISPR 32 class B conducted and radiated EMI requirements – Slew-rate controlled adaptive gate drivers – Spread spectrum reduces peak emissions • 100-kHz to 2.2-MHz switching frequency – SYNC in and SYNC out capability – Selectable diode emulation or FPWM modes • 6-mm × 6-mm VQFN-40 package • Create a custom design using the LM25143 with WEBENCH® Power Designer 2 Applications • Personal electronics: computer peripherals • Industrial: 24-V bus systems, factory automation and control, robotics, power delivery • Enterprise systems: high-performance computing 3 Description The LM25143 is a 42-V DC/DC synchronous buck controller for high-current single or dual outputs. Deriving from a family of wide-VIN range controllers, the device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high- side switch minimum on time of 65 ns provides large step-down ratios, enabling the direct conversion from 12-V or 24-V inputs to low-voltage rails for reduced system complexity and cost. The LM25143 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed. The 15-μA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM25143 from the output of the switching regulator or another available source for even lower input quiescent current and power loss. Device Information PART NUMBER PACKAGE(1) BODY SIZE (NOM) LM25143 VQFN (40) 6.00 mm × 6.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. V IN = 3.5 V...42 V SS2 RES DEMB AGND SS1 COMP2 PGND2 VOUT2 CS2 LO2 SW2 HO2 HB2 VIN COMP1 PGND1 VOUT1 CS1 LO1 SW1 HO1 HB1 VCC PG1 HOL1 LOL1 HOL2 LOL2 EN1 EN2 VCCX RT VDDA PG2 SYNCOUT VIN VIN V OUT1 = 3.3 V LM25143 * V OUT1 tracks VIN if VIN < 3.7 V V OUT2 tracks VIN if VIN < 5.4 V L O1 C O2 C IN L O2 C O1 R S2 R S1 Q L1 Q H1 Q L2 Q H2 DITH FB2 FB1 MODE VDDA I OUT1 = 12 A V OUT2 = 5 V I OUT2 = 10 A High-Efficiency Dual Step-Down Regulator LM25143 SNVSC10 – MARCH 2022 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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